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Finding the Fourth Proportional to 948, 1,421.73 and 400.31

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Solution

The fourth proportional to 948, 1,421.73 and 400.31 is: 600.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    948 : 1,421.73 = 400.31 : x
  2. Step 2: Convert to fraction form
    948/1,421.73 = 400.31/x
  3. Step 3: Cross multiply
    948x = 1,421.73 × 400.31
  4. Step 4: Simplify right side
    948x = 569,132.74
  5. Step 5: Solve for x
    x = 569,132.74/948
  6. Step 6: Final answer
    x = 600.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.